[Problem] Provided is a vehicle charging charge-reducing device that is able to reduce a charge charged to a vehicle, regardless of the type of driving source, and because there is no reliance on external energy such as a battery installed in the vehicle, etc., the vehicle charging charge-reducing device is more reasonable, and can be made smaller. [Solution] This vehicle charging charge-reducing device 1 is provided with a body part 10, and a conducting wire part 20 extending out from the body part 10. The body part 10 has: a radiation-generating layer 11 that contains a natural ore containing a radioactive substance; a first metal layer 12 that contains a metal for which the oxidation reduction potential is 0 V or less, or an alloy thereof; and a second metal layer 13 that contains a metal for which the volume electrical resistivity at 0°C is 4.7 µΩ⋅cm or less, or an alloy thereof. The conducting wire part 20 extends out from the second metal layer 13, and can be electrically connected to at least one or more prescribed connection parts that can be electrically connected within a vehicle, such as a minus terminal of a battery provided within the vehicle, etc.
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